Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 20 - Genes Within Populations - Figure 20.19 - Data Analysis: 4

Answer

The wind carries copper with it, and it does so much more on the left side, leading to selection for resistance at a much greater distance from the mine.

Work Step by Step

Copper is selecting for resistance to itself, and wind carries it far downwind. Only a small amount moves a short distance upwind, perhaps due to turbulence or some similar effect.
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